gtdshell release 0.2

A quick release containing bugfix and some new features. The ones I really needed are, contexts and gnu readline support. Here goes the full changelog:

Release 0.2

Fixed:
    - There is an invalid EOL character in the done items.
    - A command line with space only causes segfault.
    - Removed the duplicate [done: ...] from the end of done items.
    - Made contexts visible on the next item output.

Features:
    - Appended anonymous project results to the 'list' command output.
    - Added total item count to the 'list' command output.
    - Added the 'stat' command, displaying the done item count in the past week.
    - Wrapped the done item timestamps in square brackets.
    - Implemented contexts.
    - Added gnu readline support.

Internals:
    - Done item management refactoring.

Have fun.